Mitt Romney on Friday entered the fray on whether Ted Cruz was ineligible for the presidency because of his Canadian birth, reflecting on the questions raised when his father, George Romney, ran for the White House in 1968.

Here's what the former Massachusetts governor and 2012 Republican presidential candidate said on Twitter:

.@tedcruz is a "natural born citizen." Obama too. Even George Romney. This isn't the issue you're looking for.

Donald Trump, the 2016 Republican presidential front-runner, has said that Cruz's birth in Calgary, Alberta, could prove to be a "very precarious" issue for the party should the Texas senator win the nomination.

Mitt Romney on Friday entered the fray on whether Ted Cruz was ineligible for the presidency because of his Canadian birth, reflecting on the questions raised when his father, George Romney, ran for the White House in 1968.